I found this info on the Illinois Death Index.

Illinois Statewide Death Index, 1916–1950

VUKOBRATOVICH M VIOLET & F/W H-03 6032568 1950-05-01 COOK 50-05-01

VUKOBRATOVICH MILKA F/W UNK 6010186 1934-04-10 COOK CHICAGO 34-04-10

VUKOBRATOVICH RADE M/W UNK 0162706 1933-10-29 COOK CHICAGO STATE HOSP 33-10-30

hope you can figure this out or go to the Illinois death index.
Sharon